As correctly pointed out by Dr Weisbecker, you are usually dealing with few layers. Depending on the route used to produce the sample (e.g. Hummers method), you could have epoxy and hydroxyl groups decorating sheets and causing the interlayer separation (associated to 00l reflections) to dramatically increase (the amount depending on the humidity content) with respect to "graphite value". Then, as a fingerprint of the "two-dimensional structure" you have asymmetric peaks corresponding to in-plane distances.
luca On 26 November 2014 at 04:05, Patrick Weisbecker <weis...@yahoo.fr> wrote: > Most graphene samples have got few layers thus you can see some broad and > weak 00l peaks. > However the main part of the diagram is made of asymetric hk bands (10 > 11), no hkl reflexions with l non 0 (Have a look at the old papers of > Warren and Franklin): > > Patrick Weisbecker > > > ------------------------------ > *De :* Nelson Duarte <nelson.dua...@ipn.pt> > *À :* rietveld_l@ill.fr > *Envoyé le :* Mercredi 26 novembre 2014 1h34 > *Objet :* XRD graphene > > Dear rietvelds > > We index graphene samples with ICDD card of graphite, correct ? > Wich ICDD card of graphite are usualy used ? > > Thanks in advance > > Best rergards > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <alan.he...@neutronoptics.com > > > Send commands to <lists...@ill.fr> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on > http://www.mail-archive.com/rietveld_l@ill.fr/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <alan.he...@neutronoptics.com > > > Send commands to <lists...@ill.fr> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on > http://www.mail-archive.com/rietveld_l@ill.fr/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
